Electric-arc light.



S. E. DONNELLY. ELEGTRIQ ARG LIGHT. APPLICATION FILED JAN.16, 1909.

928,857. v Patented July 20, 1909.

UNITED STATES PATENT "Sll Xl-I'i l3). IHWXNElilY l l SI'lltlSVEPORT, LOUlSIANA, ASSIGNOR (F ONE-FOURTH TO M. lilLUlEli AXlfi i111,

ELECTRICARC *"WIURTH' TO 0. G. MORRIS, OF SHREVEPURT, LOUISIANA.

LIGHT.

Patented July so, 1909.

Application filed JanuaryiGylQOQ. Serial No. 4472,6251.

To (17/ 'zr/iom it may comma-n:

liril known that l, SIDNEY li. Doszvnmr, a citi/en ol' the l'nitcd Males, rcsiclin; at Shreveport, in the parish. ol'laddo and State aperture I and in communication therewith.

"l 'hewsaid bore 7) is designed to receive one of Louisiana. have inv nted new and useful lnrprm'ements in l cct i --.i c Lights, of which the following i sperilivz'dion.

My invention pci turns to electric arc lights, and more particularly to means for holding carbons.

One of the objects of the invention is to provide a simple, easily adj ustcd and reliable device for fixing a carbon in and with respect to a holder body, and this in such manner Y that expansion due to heat is not liable to a loosen the carbon in the said body.

Another object of the invention is the provision of means for ell'ecting electrical connection between the holder body and a conductor and for electrically isolating the said body and the conductor l'rom the support therefor, and, at the same time, clamping the insulation employed in such manner that there is no liability of casual movement ol' the insulation or of parts tl'iereagainst, and consequently no liability ol' the insulation wearing out after a short period ol use.

Other objects of the invention will be l'ully understood from the following description and claims when the same are read in connection with the drawings, accompanying and forming part of this specification, in which:

Figure 1 is a horizontal section taken through a carbon and the support therefor in a plane above the holder body and illustrating my improvements in plan. Fig. 2 is a side elevation of the same. Fig. 3 is a detail view illustrating one ol the rocking clamping devices comprised in my improvements as removed.

Similar letters designate correspmuling parts in all of the views ol' the drawings, rclei-ring to which: i

A is a carbon. I

B is the conventional or any other suitable support for the carbon, and is the holder body through which the carbon is connected with the support. The said body (l is preferably of metal and is provided adjacent one end with a vertically disposed aperture o for the reccption ol' the carbon. It will also be observed by rel ercnce to Fig. 1 that the body C is provided with a transycrsc or horizontal bore 1), which is arranged at rocking or axially movable clamping device l) of my invention, and it will be seen by comparing Figs. 1 and 3 that the said device is in the generullorm ol' a pin or bolt that is to say, it comprises a shank c the end portions of which ol' circular l'orrn in crosssection, and a head (1 ol' angular or other suitable form. It is peculiar, however, in that t it is provided with an intermediate eccentric portion 0, arranged as shown, so as to directly contact with the carbon and assure great locking pressure against the carbon when the device i, slightly turned about its axis. Because of the direct connection between the eccentric portion a and the carbon 1 it will be manifest that tendency of the carbon to gravitate only serves to bind it the more iirmly in the holder. It will also be manifest that the clamping device D is strongly supported at opposite sides of the point where it contacts with the carbon, and that it may be expeditiously and easily turned either to lix or to release the carbon at the pleasure of an attendant, the head d serving in suclrcaso for the engagement of the fingers ol' the attendant or for the application of a wrench or the like; and further that adjustment of the carbon or the removal of the same and the placing of a new carbon in position entails adjustment of but one elemerit, viz: the device l).

At its end remote from the carbon A the holder body C is bifurcated, as indicated by f, and. in'the inner end wall of said. bifurcation is a shallow groove g, While in the side walls of the bifurcation nlincd transverse apertures 7t, ol circular vform, are provided. The support B extends vertically through the bil'urcationf, and the groove g] is designed to receive a Wire or other conductor E, while the apertures h have [or their ol'lice to receive the device F for clamping the insula tion, presently described, and for adjustably lining the said insulation, the holder body 0 and the conductor E with respect to the support B. The said clamping device F is pro- Vided with a head i and also with a shank, the latter being made up of end portions j, of circular form in crossscction, and an intermediate eccentric portion It: The insulating material, indicated by G, extends all around the portion of the support B in the bifurcation of the holder body 0, and I prefer to interpose a metallic strip H between the said insulating material and the conductor E, and a similar stri 1 between the insulating ma terial and t e eccehtric portion is of the clamping device F. Thus it willbe manifest that when the clamping device F is turned about its axis to press the eccentric portion is toward the su port B, the insulating material, the metallic strips, the conductor E, the holder body C and the support B will all be firml held in position, without liability of casua movement of any of the parts and the Wear generally incidental to such movement. From this it follows that the insulating material will remain fixed with respect to the other parts until the clamping device F is loosened, and there is no liability of heating taking place because of any of the parts becoming loose; also, that the Weight oi. the holder body C and the parts carried thereby l Will tend at all times to keep the clamping parts'comprised 1n. the improvements are device F tight, and yet when. occasion. de-

*-mands the said clamping device I. in be expeditiously and easily turned or rocked toward the left, I

In addition to the-practical advantages hereinbefore ascribed to my improvements, it-will be appreciated that the improvements as a-whole areecompact, and that all of the Well adapted to withstand the usage and ex.- posureto which devices of corresponding character are ordinarily subjected.

Having described. my invention, what ll claim and desire to secure by Letters-Patent, is: y

l. in. means for the purpose described, the combination of a support, an electric conductor, a holder body apcrtured to receive the support and the conductor, insulation surrounding the support and interposed tween the and the walls of the aperture, and a clamping device having end portions of circular form in cross-section journaled in the holder body at opposite sides of the ape l.in'e,'and also having an intermediate eccentric ortior adapted to he presented to the insulation.

2. in means 1" or the purpose described, the combination of a support, an electric conductor, a holder body having a bifurcation to receive the support and conductor, and also ll&Vl.1') 9,' a hallow groove in the inner W all of the bihnrcation to seat the comluetor, insulation surroundii the supg'iort and ari on of the holder body, and a clannging device having end portions oll circular form in cross-section journalod in the walls of the l urca'tlon, and an intermediate eccentric portion adapted. to be p resented to t 1e insulation and also having a head at one end.

In testimony whereof I have hereunto set my hand in presence of two subscribing witmesses.

Y E. DGl li'E lqlIET.

SIDNE lVitness i Enron,

J. H. Pans! rrr. 

